Abstract
Dielectric spectroscopy was performed on uniaxially compacted C60 pellets at selected frequencies from 1 kHz to 1 MHz as the temperature rose from 100 to 530 K. A new dielectric relaxation with activation energy of 2.45±0.05 eV was discerned, but which disappeared when the pellet was heated a second time. Dipoles relaxation accompanying orientational glass transition was observed at lower temperatures as asymmetrical loss peaks, showing departure from Debye behavior, but correlation among the oscillators decreased during the second heating cycle, and the activation energy was also reduced. We analyze the asymmetrical peaks with the help of Ngai's correlated-state model, and suggest that residual stresses in the pressed pellets enhance the correlation between grain boundary motion and the reorientational jumps of C60 molecules.
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